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lvm2/lib/metadata/metadata.h
Alasdair G Kergon d591d04103 device: Tag I/O for each mda on a device separately in log messages. 
Mark the first metadata area on each text format PV as MDA_PRIMARY.
Pass this information down to the device layer so that when
there are two metadata areas on a block device, we can easily
distinguish two independent streams of I/O.
2017-12-07 03:48:11 +00:00

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/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2013 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* This is the in core representation of a volume group and its
* associated physical and logical volumes.
*/
#ifndef _LVM_METADATA_H
#define _LVM_METADATA_H
#include "ctype.h"
#include "dev-cache.h"
#include "lvm-string.h"
#include "metadata-exported.h"
//#define MAX_STRIPES 128U
//#define SECTOR_SHIFT 9L
//#define SECTOR_SIZE ( 1L << SECTOR_SHIFT )
//#define STRIPE_SIZE_MIN ( (unsigned) lvm_getpagesize() >> SECTOR_SHIFT) /* PAGESIZE in sectors */
//#define STRIPE_SIZE_MAX ( 512L * 1024L >> SECTOR_SHIFT) /* 512 KB in sectors */
//#define STRIPE_SIZE_LIMIT ((UINT_MAX >> 2) + 1)
//#define MAX_RESTRICTED_LVS 255 /* Used by FMT_RESTRICTED_LVIDS */
#define MIN_PE_SIZE (8192L >> SECTOR_SHIFT) /* 8 KB in sectors - format1 only */
#define MAX_PE_SIZE (16L * 1024L * (1024L >> SECTOR_SHIFT) * 1024L) /* format1 only */
#define MIRROR_LOG_OFFSET 2 /* sectors */
#define VG_MEMPOOL_CHUNK 10240 /* in bytes, hint only */
/*
* Ceiling(n / sz)
*/
#define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz))
/*
* Ceiling(n / size) * size
*/
#define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
/* Various flags */
/* See metadata-exported.h for the complete list. */
/* Note that the bits no longer necessarily correspond to LVM1 disk format */
/* May any free extents on this PV be used or must they be left free? */
#define SPINDOWN_LV UINT64_C(0x00000010) /* LV */
#define BADBLOCK_ON UINT64_C(0x00000020) /* LV */
//#define VIRTUAL UINT64_C(0x00010000) /* LV - internal use only */
#define PRECOMMITTED UINT64_C(0x00200000) /* VG - internal use only */
#define POSTORDER_FLAG UINT64_C(0x02000000) /* Not real flags, reserved for */
#define POSTORDER_OPEN_FLAG UINT64_C(0x04000000) /* temporary use inside vg_read_internal. */
#define SHARED UINT64_C(0x00000800) /* VG */
/* Format features flags */
#define FMT_PRECOMMIT 0x00000040U /* Supports pre-commit? */
struct dm_config_tree;
struct metadata_area;
struct alloc_handle;
struct lvmcache_info;
struct cached_vg_fmtdata;
/* Per-format per-metadata area operations */
struct metadata_area_ops {
struct dm_list list;
struct volume_group *(*vg_read) (struct format_instance * fi,
const char *vg_name,
struct metadata_area * mda,
struct cached_vg_fmtdata **vg_fmtdata,
unsigned *use_previous_vg,
int single_device);
struct volume_group *(*vg_read_precommit) (struct format_instance * fi,
const char *vg_name,
struct metadata_area * mda,
struct cached_vg_fmtdata **vg_fmtdata,
unsigned *use_previous_vg);
/*
* Write out complete VG metadata. You must ensure internal
* consistency before calling. eg. PEs can't refer to PVs not
* part of the VG.
*
* It is also the responsibility of the caller to ensure external
* consistency, eg by calling pv_write() if removing PVs from
* a VG or calling vg_write() a second time if splitting a VG
* into two.
*
* vg_write() should not read or write from any PVs not included
* in the volume_group structure it is handed.
* (format1 currently breaks this rule.)
*/
int (*vg_write) (struct format_instance * fid, struct volume_group * vg,
struct metadata_area * mda);
int (*vg_precommit) (struct format_instance * fid,
struct volume_group * vg,
struct metadata_area * mda);
int (*vg_commit) (struct format_instance * fid,
struct volume_group * vg, struct metadata_area * mda);
int (*vg_revert) (struct format_instance * fid,
struct volume_group * vg, struct metadata_area * mda);
int (*vg_remove) (struct format_instance * fi, struct volume_group * vg,
struct metadata_area * mda);
/*
* Per location copy constructor.
*/
void *(*mda_metadata_locn_copy) (struct dm_pool *mem, void *metadata_locn);
/*
* Per location description for logging.
*/
const char *(*mda_metadata_locn_name) (void *metadata_locn);
uint64_t (*mda_metadata_locn_offset) (void *metadata_locn);
/*
* Returns number of free sectors in given metadata area.
*/
uint64_t (*mda_free_sectors) (struct metadata_area *mda);
/*
* Returns number of total sectors in given metadata area.
*/
uint64_t (*mda_total_sectors) (struct metadata_area *mda);
/*
* Check if metadata area belongs to vg
*/
int (*mda_in_vg) (struct format_instance * fi,
struct volume_group * vg, struct metadata_area *mda);
/*
* Analyze a metadata area on a PV.
*/
int (*pv_analyze_mda) (const struct format_type * fmt,
struct metadata_area *mda);
/*
* Do these two metadata_area structures match with respect to
* their underlying location?
*/
unsigned (*mda_locns_match)(struct metadata_area *mda1,
struct metadata_area *mda2);
struct device *(*mda_get_device)(struct metadata_area *mda);
int (*mda_export_text)(struct metadata_area *mda, struct dm_config_tree *cft,
struct dm_config_node *parent);
int (*mda_import_text)(struct lvmcache_info *info, const struct dm_config_node *cn);
};
#define MDA_IGNORED 0x00000001
#define MDA_INCONSISTENT 0x00000002
#define MDA_FAILED 0x00000004
/* The primary metadata area on a device if the format supports more than one. */
#define MDA_PRIMARY 0x00000008
#define mda_is_primary(mda) (((mda->status) & MDA_PRIMARY) ? 1 : 0)
#define MDA_CONTENT_REASON(primary_mda) ((primary_mda) ? DEV_IO_MDA_CONTENT : DEV_IO_MDA_EXTRA_CONTENT)
#define MDA_HEADER_REASON(primary_mda) ((primary_mda) ? DEV_IO_MDA_HEADER : DEV_IO_MDA_EXTRA_HEADER)
struct metadata_area {
struct dm_list list;
struct metadata_area_ops *ops;
void *metadata_locn;
uint32_t status;
};
struct metadata_area *mda_copy(struct dm_pool *mem,
struct metadata_area *mda);
unsigned mda_is_ignored(struct metadata_area *mda);
void mda_set_ignored(struct metadata_area *mda, unsigned mda_ignored);
unsigned mda_locns_match(struct metadata_area *mda1, struct metadata_area *mda2);
struct device *mda_get_device(struct metadata_area *mda);
struct format_instance_ctx {
uint32_t type;
union {
const char *pv_id;
struct {
const char *vg_name;
const char *vg_id;
} vg_ref;
void *private;
} context;
};
struct format_instance *alloc_fid(const struct format_type *fmt,
const struct format_instance_ctx *fic);
/*
* Format instance must always be set using pv_set_fid or vg_set_fid
* (NULL value as well), never asign it directly! This is essential
* for proper reference counting for the format instance.
*/
void pv_set_fid(struct physical_volume *pv, struct format_instance *fid);
void vg_set_fid(struct volume_group *vg, struct format_instance *fid);
/* FIXME: Add generic interface for mda counts based on given key. */
int fid_add_mda(struct format_instance *fid, struct metadata_area *mda,
const char *key, size_t key_len, const unsigned sub_key);
int fid_add_mdas(struct format_instance *fid, struct dm_list *mdas,
const char *key, size_t key_len);
int fid_remove_mda(struct format_instance *fid, struct metadata_area *mda,
const char *key, size_t key_len, const unsigned sub_key);
struct metadata_area *fid_get_mda_indexed(struct format_instance *fid,
const char *key, size_t key_len, const unsigned sub_key);
int mdas_empty_or_ignored(struct dm_list *mdas);
#define seg_pvseg(seg, s) (seg)->areas[(s)].u.pv.pvseg
#define seg_dev(seg, s) (seg)->areas[(s)].u.pv.pvseg->pv->dev
#define seg_pe(seg, s) (seg)->areas[(s)].u.pv.pvseg->pe
#define seg_le(seg, s) (seg)->areas[(s)].u.lv.le
#define seg_metale(seg, s) (seg)->meta_areas[(s)].u.lv.le
struct name_list {
struct dm_list list;
char *name;
};
struct mda_list {
struct dm_list list;
struct device_area mda;
};
struct peg_list {
struct dm_list list;
struct pv_segment *peg;
};
struct seg_list {
struct dm_list list;
unsigned count;
struct lv_segment *seg;
};
/*
* Ownership of objects passes to caller.
*/
struct format_handler {
/*
* Scan any metadata areas that aren't referenced in PV labels
*/
int (*scan) (const struct format_type * fmt, const char *vgname);
/*
* Return PV with given path.
*/
int (*pv_read) (const struct format_type * fmt, const char *pv_name,
struct physical_volume * pv, int scan_label_only);
/*
* Initialise a new PV.
*/
int (*pv_initialise) (const struct format_type * fmt,
struct pv_create_args *pva,
struct physical_volume * pv);
/*
* Tweak an already filled out a pv ready for importing into a
* vg. eg. pe_count is format specific.
*/
int (*pv_setup) (const struct format_type * fmt,
struct physical_volume * pv,
struct volume_group * vg);
/*
* Add metadata area to a PV. Changes will take effect on pv_write.
*/
int (*pv_add_metadata_area) (const struct format_type * fmt,
struct physical_volume * pv,
int pe_start_locked,
unsigned metadata_index,
uint64_t metadata_size,
unsigned metadata_ignored);
/*
* Remove metadata area from a PV. Changes will take effect on pv_write.
*/
int (*pv_remove_metadata_area) (const struct format_type *fmt,
struct physical_volume *pv,
unsigned metadata_index);
/*
* Recalculate the PV size taking into account any existing metadata areas.
*/
int (*pv_resize) (const struct format_type *fmt,
struct physical_volume *pv,
struct volume_group *vg,
uint64_t size);
/*
* Write a PV structure to disk. Fails if the PV is in a VG ie
* pv->vg_name must be a valid orphan VG name
*/
int (*pv_write) (const struct format_type * fmt,
struct physical_volume * pv);
/*
* Check if PV needs rewriting. This is used to check whether there are any
* format-specific changes before actually writing the PV (by calling pv_write).
* With this, we can call pv_write conditionally only if it's really needed.
*/
int (*pv_needs_rewrite) (const struct format_type *fmt,
struct physical_volume *pv,
int *needs_rewrite);
/*
* Tweak an already filled out a lv eg, check there
* aren't too many extents.
*/
int (*lv_setup) (struct format_instance * fi,
struct logical_volume * lv);
/*
* Tweak an already filled out vg. eg, max_pv is format
* specific.
*/
int (*vg_setup) (struct format_instance * fi, struct volume_group * vg);
/*
* Check whether particular segment type is supported.
*/
int (*segtype_supported) (struct format_instance *fid,
const struct segment_type *segtype);
/*
* Create format instance with a particular metadata area
*/
struct format_instance *(*create_instance) (const struct format_type *fmt,
const struct format_instance_ctx *fic);
/*
* Destructor for format instance
*/
void (*destroy_instance) (struct format_instance * fid);
/*
* Destructor for format type
*/
void (*destroy) (struct format_type * fmt);
};
/*
* Utility functions
*/
unsigned long set_pe_align(struct physical_volume *pv, unsigned long data_alignment);
unsigned long set_pe_align_offset(struct physical_volume *pv,
unsigned long data_alignment_offset);
int pv_write_orphan(struct cmd_context *cmd, struct physical_volume *pv);
int check_dev_block_size_for_vg(struct device *dev, const struct volume_group *vg,
unsigned int *max_phys_block_size_found);
int check_pv_dev_sizes(struct volume_group *vg);
uint32_t vg_bad_status_bits(const struct volume_group *vg, uint64_t status);
int add_pv_to_vg(struct volume_group *vg, const char *pv_name,
struct physical_volume *pv, int new_pv);
/* Find a PV within a given VG */
int get_pv_from_vg_by_id(const struct format_type *fmt, const char *vg_name,
const char *vgid, const char *pvid,
struct physical_volume *pv);
struct logical_volume *find_lv_in_vg_by_lvid(struct volume_group *vg,
const union lvid *lvid);
struct lv_list *find_lv_in_lv_list(const struct dm_list *ll,
const struct logical_volume *lv);
/* Find LV with given lvid (used during activation) */
struct logical_volume *lv_from_lvid(struct cmd_context *cmd,
const char *lvid_s,
unsigned precommitted);
/* FIXME Merge these functions with ones above */
struct physical_volume *find_pv(struct volume_group *vg, struct device *dev);
struct pv_list *find_pv_in_pv_list(const struct dm_list *pl,
const struct physical_volume *pv);
/* Find LV segment containing given LE */
struct lv_segment *find_seg_by_le(const struct logical_volume *lv, uint32_t le);
/* Find pool LV segment given a thin pool data or metadata segment. */
struct lv_segment *find_pool_seg(const struct lv_segment *seg);
/* Find some unused device_id for thin pool LV segment. */
uint32_t get_free_pool_device_id(struct lv_segment *thin_pool_seg);
/* Check if the new thin-pool could be used for lvm2 thin volumes */
int check_new_thin_pool(const struct logical_volume *pool_lv);
/*
* Remove a dev_dir if present.
*/
const char *strip_dir(const char *vg_name, const char *dev_dir);
struct logical_volume *alloc_lv(struct dm_pool *mem);
/*
* Checks that an lv has no gaps or overlapping segments.
* Set complete_vg to perform additional VG level checks.
*/
int check_lv_segments(struct logical_volume *lv, int complete_vg);
/*
* Does every LV segment have the same number of stripes?
*/
int lv_has_constant_stripes(struct logical_volume *lv);
/*
* Sometimes (eg, after an lvextend), it is possible to merge two
* adjacent segments into a single segment. This function trys
* to merge as many segments as possible.
*/
int lv_merge_segments(struct logical_volume *lv);
/*
* Ensure there's a segment boundary at a given LE, splitting if necessary
*/
int lv_split_segment(struct logical_volume *lv, uint32_t le);
/*
* Add/remove upward link from underlying LV to the segment using it
* FIXME: ridiculously long name
*/
int add_seg_to_segs_using_this_lv(struct logical_volume *lv, struct lv_segment *seg);
int remove_seg_from_segs_using_this_lv(struct logical_volume *lv, struct lv_segment *seg);
int add_glv_to_indirect_glvs(struct dm_pool *mem,
struct generic_logical_volume *origin_glv,
struct generic_logical_volume *glv);
int remove_glv_from_indirect_glvs(struct generic_logical_volume *origin_glv,
struct generic_logical_volume *glv);
int for_each_sub_lv_except_pools(struct logical_volume *lv,
int (*fn)(struct logical_volume *lv, void *data),
void *data);
int for_each_sub_lv(struct logical_volume *lv,
int (*fn)(struct logical_volume *lv, void *data),
void *data);
int move_lv_segments(struct logical_volume *lv_to,
struct logical_volume *lv_from,
uint64_t set_status, uint64_t reset_status);
/*
* Calculate readahead from underlying PV devices
*/
void lv_calculate_readahead(const struct logical_volume *lv, uint32_t *read_ahead);
/*
* For internal metadata caching.
*/
size_t export_vg_to_buffer(struct volume_group *vg, char **buf);
struct dm_config_tree *export_vg_to_config_tree(struct volume_group *vg);
struct volume_group *import_vg_from_config_tree(const struct dm_config_tree *cft,
struct format_instance *fid);
struct volume_group *import_vg_from_lvmetad_config_tree(const struct dm_config_tree *cft,
struct format_instance *fid);
/*
* Mirroring functions
*/
/*
* Given mirror image or mirror log segment, find corresponding mirror segment
*/
int fixup_imported_mirrors(struct volume_group *vg);
/*
* From thin_manip.c
*/
int attach_pool_lv(struct lv_segment *seg, struct logical_volume *pool_lv,
struct logical_volume *origin,
struct generic_logical_volume *indirect_origin,
struct logical_volume *merge_lv);
int detach_pool_lv(struct lv_segment *seg);
int attach_pool_message(struct lv_segment *pool_seg, dm_thin_message_t type,
struct logical_volume *lv, uint32_t delete_id,
int no_update);
int lv_is_merging_thin_snapshot(const struct logical_volume *lv);
int pool_has_message(const struct lv_segment *seg,
const struct logical_volume *lv, uint32_t device_id);
int pool_metadata_min_threshold(const struct lv_segment *pool_seg);
int pool_below_threshold(const struct lv_segment *pool_seg);
int pool_check_overprovisioning(const struct logical_volume *lv);
int create_pool(struct logical_volume *pool_lv, const struct segment_type *segtype,
struct alloc_handle *ah, uint32_t stripes, uint32_t stripe_size);
/*
* Begin skeleton for external LVM library
*/
struct id pv_id(const struct physical_volume *pv);
const struct format_type *pv_format_type(const struct physical_volume *pv);
struct id pv_vgid(const struct physical_volume *pv);
uint64_t find_min_mda_size(struct dm_list *mdas);
char *tags_format_and_copy(struct dm_pool *mem, const struct dm_list *tagsl);
#endif
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